SDI 2240 & 2480 HERMETIC HIGH-PERFORMANCE ACCELEROMETERS Description：

Datasheet

The high-performance Models 2240 and 2480 Specialty Hermetic MEMS DC Test & Measurement Accelerometer Modules from Silicon Designs (SDI) provide enhanced performance over temperature in zero to medium frequency applications experiencing large or rapid temperature variations or maintaining hot or cold extremes for extended periods of time where environmental conditions require a hermetic package.

The SDI Models 2240 and 2480 contain a single or three orthogonally mounted, proprietary SDI Model 1522 accelerometer LCC chips, making them even less sensitive to temperature changes and gradients from -55 to +125°C and greatly reducing bias and scale factor temperature shifts for premium performance. Each temperature compensated, premium accelerometer LCC is individually tested, calibrated and verified in a climate chamber.

Onboard voltage regulation and an internal voltage reference eliminate the need for precision power supplies. Integrated amplifiers and low impedance outputs support up to 2000 feet of cable.

Their rugged, lightweight, IP67 rated hermetically sealed titanium cases and IP61 rated specialty connectors allow for customized cable lengths and easy repositioning. The connector can also meet IP67 when sealed with a boot, sleeve, or heat shrink. Either case is easily mounted via two screws, adhesive, or by attaching a magnet.

Both the 2240 and 2480 come with an initial calibration report featuring additional information about the linearity, output, phase, and frequency response as tested for each unit.

ZERO TO MEDIUM FREQUENCY APPLICATIONS

OPERATION

SDI Models 2240 and 2480 MEMS DC Accelerometers provide optimal performance when they are connected to instrumentation in a differential configuration using both the AOP and AON output signals, but they also support single ended operation for complete flexibility.

These Accelerometers produce differential analog output voltage pairs (AON & AOP) which vary with acceleration. The signal outputs are fully differential about a common mode voltage of approximately 2.5 volts. At zero acceleration, the output differential voltage is nominally 0 volts DC; at ±full scale acceleration, the output is ±4 volts DC, respectively, as shown in the figure (below). The output scale factor is independent from the supply voltage of +8 to +32 volts.

When a differential connection is not possible, SDI recommends connecting the accelerometer to instrumentation in single ended mode by connecting AOP and GND to the instrumentation and leaving AON disconnected. Keep in mind that the signal to noise ratio is reduced by half for a single-ended vs. a differential connection.

PERFORMANCE - ALL VERSIONS

All Models: Unless otherwise specified, Vs=+8 to +32 VDC, TC=25°C, Differential Mode. Span = ±g range = 8000 mV.

Note (1): For 2g thru 50g only; 100g and greater versions are tested and specified from -65 to +65g.

NOTICE: Stresses greater than those listed may cause permanent damage to the device. These are maximum stress ratings only. Functional operation of the device at or above these conditions is not implied.

SDI Model 2240

SDI Model 2480